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annotate xml/en/docs/http/ngx_http_headers_module.xml @ 1964:2a3c58dcb3e8

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Documented support for the 308 Permanent Redirect.
author Yaroslav Zhuravlev <yar@nginx.com>
date Mon, 17 Apr 2017 19:29:14 +0300
parents 4b6d7686e00f
children 1ece24f10f2a
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_headers_module"
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11 link="/en/docs/http/ngx_http_headers_module.html"
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12 lang="en"
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13 rev="8">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_headers_module</literal> module allows adding
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19 the <header>Expires</header> and <header>Cache-Control</header> header
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20 fields, and arbitrary fields, to a response header.
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21 </para>
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22
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23 </section>
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25
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
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30 expires 24h;
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31 expires modified +24h;
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32 expires @24h;
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33 expires 0;
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34 expires -1;
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35 expires epoch;
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36 expires $expires;
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37 add_header Cache-Control private;
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38 </example>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="directives" name="Directives">
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45
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46 <directive name="add_header">
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47 <syntax>
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48 <value>name</value> <value>value</value>
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49 [<literal>always</literal>]</syntax>
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50 <default/>
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51 <context>http</context>
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52 <context>server</context>
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53 <context>location</context>
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54 <context>if in location</context>
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56 <para>
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57 Adds the specified field to a response header provided that
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58 the response code equals 200, 201, 204, 206, 301, 302, 303, 304, 307, or 308.
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59 A value can contain variables.
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60 </para>
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61
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62 <para>
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63 There could be several <literal>add_header</literal> directives.
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64 These directives are inherited from the previous level if and
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65 only if there are no
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66 <literal>add_header</literal>
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67 directives defined on the current level.
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68 </para>
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69
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70 <para>
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71 If the <literal>always</literal> parameter is specified (1.7.5),
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72 the header field will be added regardless of the response code.
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73 </para>
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74
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75 </directive>
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77
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78 <directive name="expires">
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79 <syntax>[<literal>modified</literal>] <value>time</value></syntax>
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80 <syntax>
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81 <literal>epoch</literal> |
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82 <literal>max</literal> |
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83 <literal>off</literal></syntax>
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84 <default>off</default>
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85 <context>http</context>
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86 <context>server</context>
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87 <context>location</context>
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88 <context>if in location</context>
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89
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90 <para>
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91 Enables or disables adding or modifying the <header>Expires</header>
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92 and <header>Cache-Control</header> response header fields provided that
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93 the response code equals 200, 201, 204, 206, 301, 302, 303, 304, 307, or 308.
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94 The parameter can be a positive or negative
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95 <link doc="../syntax.xml">time</link>.
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96 </para>
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97
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98 <para>
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99 The time in the <header>Expires</header> field is computed as a sum of the
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100 current time and <value>time</value> specified in the directive.
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101 If the <literal>modified</literal> parameter is used (0.7.0, 0.6.32)
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102 then the time is computed as a sum of the file’s modification time and
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103 the <value>time</value> specified in the directive.
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104 </para>
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105
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106 <para>
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107 In addition, it is possible to specify a time of day using
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108 the “<literal>@</literal>” prefix (0.7.9, 0.6.34):
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109 <example>
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110 expires @15h30m;
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111 </example>
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112 </para>
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113
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114 <para>
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115 The <literal>epoch</literal> parameter corresponds to the absolute time
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116 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”.
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117 The contents of the <header>Cache-Control</header> field depends
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118 on the sign of the specified time:
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119 <list type="bullet">
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120
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121 <listitem>
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122 time is negative — <header>Cache-Control: no-cache</header>.
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123 </listitem>
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124
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125 <listitem>
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126 time is positive or zero —
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127 <header>Cache-Control: max-age=<value>t</value></header>,
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128 where <value>t</value> is a time specified in the directive, in seconds.
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129 </listitem>
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130
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131 </list>
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132 </para>
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133
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134 <para>
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135 The <literal>max</literal> parameter sets <header>Expires</header>
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136 to the value “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”,
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137 and <header>Cache-Control</header> to 10 years.
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138 </para>
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139
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140 <para>
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141 The <literal>off</literal> parameter disables adding or modifying the
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142 <header>Expires</header> and <header>Cache-Control</header> response
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143 header fields.
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144 </para>
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145
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146 <para>
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147 The last parameter value can contain variables (1.7.9):
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148 <example>
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149 map $sent_http_content_type $expires {
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150 default off;
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151 application/pdf 42d;
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152 ~image/ max;
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153 }
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154
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155 expires $expires;
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156 </example>
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157 </para>
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158
353
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159 </directive>
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160
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161 </section>
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162
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163 </module>